Publication

Strengthening mechanisms in dilute and random solid solution high-entropy BCC alloys

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Mechanism and energetics of < c plus a > dislocation cross-slip in hcp metals

William Curtin, Zhaoxuan Wu

Hexagonal close-packed (hcp) metals such as Mg, Ti, and Zr are lightweight and/or durable metals with critical structural applications in the automotive (Mg), aerospace (Ti), and nuclear (Zr) industries. The hcp structure, however, brings significant compl ...

National Academy of Sciences2016

Theory of strengthening in fcc high entropy alloys

William Curtin, Céline Varvenne

High Entropy Alloys (HEAs) are a new class of random alloys having impressive strength and toughness. Here, a mechanistic, parameter-free, and predictive theory for the temperature-, composition-, and strain-rate-dependence of the plastic yield strength of ...

Pergamon-Elsevier Science Ltd2016

A new strain rate dependent continuum framework for Mg alloys

Magnesium (Mg) alloys have recently been put under the spotlight for their specific strength, the highest among structural metals. Although the mechanical behaviour of Mg alloys at quasi-static strain rates has been extensively modelled in the recent years ...

Elsevier Science Bv2016

Multiscale diffusion method for simulations of long-time defect evolution with application to dislocation climb

William Curtin, Kristopher Learion Baker

In many problems of interest to materials scientists and engineers, the evolution of crystalline extended defects (dislocations, cracks, grain boundaries, interfaces, voids, precipitates) is controlled by the flow of point defects (interstitial/substitutio ...

Pergamon-Elsevier Science Ltd2016

Coupled 3D dislocation dynamics at nano- and micro-scales

Jean-François Molinari, Guillaume Anciaux, Jaehyun Cho

Dislocation dynamics are important to understand material plasticity effects, e.g. size dependent strain hardening. Dislocations are nucleated at nano-scale, and interact with other defects including grain boundaries and other dislocations at micro-scale. ...

2016

Dislocations 2016

Jean-François Molinari, Guillaume Anciaux, Jaehyun Cho

Dislocation dynamics are important to understand material plasticity in small-sized materials. In case of face-centered cubic crystalline systems, densities of initial dislocations, dislocation nucleations and starvations processes influence material stren ...

2016

Energetics of dislocation transformations in hcp metals

William Curtin, Binglun Yin, Zhaoxuan Wu

Dislocation core structures of hcp metals are highly complex and differ significantly among the hcp family. Some dislocations undergo unconventional transformations that have significant effects on the material plastic flow. Here, the energetics of disloca ...

Elsevier2016

Microalloying for the controllable delay of precipitate formation in metal alloys

William Curtin, Michael Frederick Francis

A model is presented to predict the effectiveness of dilute solutes in delaying precipitate formation, with application to natural and artificial aging in metal alloys. Control of aging is achieved via the binding, at natural aging temperatures, and releas ...

Elsevier2016

Solute strengthening at high temperatures

William Curtin

The high temperature behavior of solute strengthening has previously been treated approximately using various scaling arguments, resulting in logarithmic and power-law scalings for the stress-dependent energy barrier Delta E(tau) versus stress tau. Here, a ...

Iop Publishing Ltd2016

Thermally-activated flow in nominally binary Al-Mg alloys

William Curtin

The temperature-dependent flow behavior in nominally binary Al-Mg alloys measured recently (Jobba etal., 2015; Niewczas et al., 2015) is interpreted in the context of a parameter-free solute strengthening model. The recent measurements show consistently hi ...

Elsevier2016